Hydro-Urea Storage, Lactic Acid Substitution, and Formulating with Sodium Lactate

Hi,

Regarding your questions about Hydro-Urea storage and using Lactic Acid:

• Hydro-Urea Storage: For the unused portion of Hydro-Urea, you can store it in the refrigerator if convenient. If not, storing it in a room that is not exposed to direct sunlight, light, or heat, and is well-ventilated and not stuffy, is sufficient.
• Lactic Acid vs. Gluconolactone: Yes, you can use Lactic Acid to replace Gluconolactone in your formulation. Please adjust the pH of the formula to be in the range of approximately 3.5-5.5 for stability and good efficacy (Amlactin, a major brand using similar formulas, uses a pH level of 5.0).

Regarding your other questions:

• Multiple Lactates in Amlactin: Amlactin states that using Ammonium Lactate, Sodium Lactate, and Potassium Lactate together yields better results than using only one type of Lactate. However, there is no independent research to confirm this claim definitively.
• Formulating with Sodium Lactate: Since Sodium Lactate has high electrolyte content, it can make formulating creams difficult. It is recommended to choose thickeners or bases that are not problematic with electrolytes, such as Silky Serum Base (for serum texture) or Hydroxyethyl Cellulose (for gel texture).

Hope this summary is helpful!

Thank you.